Screw-cutting machine.



PATENTED SEPT.26,1905. L. SIUSSMAN.

SGRBW CUTTING MACHINE.

APPLICATION FILED JAN; 7, 1904.

M? I i g ATTORNEYS;

' radially, said jaws beingpivoted, as indicated UNITED STATES PATENT oFFIoE.

LEON SUSSMAN, OF BAYONNE, NEW JERSEY.

SCREW-CUTTING MACHINE.

To all whom it may concern.-

Be it known that I, LEON SUssMAN, a citizen of the United States, and aresident of Bayonne, in the county of Hudson, State of New Jersey, have invented certain new and useful Improvements in Screw-Cutting Machines, of which the following is a specification.

My invention relates to improvements in screw-cutting machines or lathes, and has for its object to provide a simple structure for cutting threads on rods, pipes, or like blanks and to provide means for either manually or automatically interrupting the operation of the two at the proper moment.

To this end my invention consists in certain features of construction, which will be pointed out in the appended claim.

Reference is to be had to the accompanying drawings, which illustrate two typical forms of my invention, and in which Figure 1 is a side elevation of my improved screw-cutting tool in its closed position. Fig. 2 is a corresponding end view of the same. Fig. 3 isa side elevation of a slightly-different form of my invention in an open position.

Fig. 4 is a corresponding end view. Fig. 5 is a longitudinal section of the two in a closed position.. Fig. 6 is a longitudinal sectionof the second form of my invention, and Fig. 7 is a cross-section on line 7 7 of Fig. 6.

E designates a shank or. rod which forms a continuation and at the same time a support for the body A, whichis open at its opposite end and also has longitudinal-slots in which the shanks of the jaws C are adapted to move at C, and being subjected to the influence of springs 0 which tend to throw the jaws into the open position. (Shown in Fig. 3.) In order to hold the jaws in the closed position, I provide a collar B, mounted to slide on the body A lengthwise and adapted to engage the shanks of the jaws G by means of projections B, preferably in the nature of adjustable screws,

which are adapted to engage recesses C of said shanks and to move in the slots of the body A, which receive said shanks. Thus the collar B is at the same time held against turning. It will be understood that the jaws C will close ,more or less when the collar is in its forward position, (shown in Figs. 1 and 5,) according to the adjustment of the projections or screws B. In order to project the collar into. its forward position, I prefer to provide a lever A, fulcrumed on the body A at A and provided with an arm A adapted to engage Specification of Letters Patent.

Application filed January 7,1904. Serial No. 188,068.

Patented Sept. 26, 1905.

the collar B and. to move the same forward.

Preferably the body A is formed with a lug is pivotally mounted. When it is desired to open the jaws, so asto arrest the cutting action, the operator may slide the collar B back by hand. Where an automatic stop is desired, the collar B may be provided with a rod B adjustably secured thereto, as by means of a set-screw B in a sleeve B which receives said rod B It will be understood that the forward end of the rod B will be engaged by theflanged carrier or chuck to which the blank, such as a pipe or rod, is secured, and thus the collar B will be thrown back at the proper moment according to the length to which the rod B projects, so that the projection B will enter the recesses O and the springs C will then cause the jaws to open suddenly, so as to arrest the cutting action. When the jaws C are in the closed position, the surfaces of the shanks of said jaws which are engaged by the projection B are parallel with the outer surface of the bodyA upon which the collar B slides. It will thus be seen that as long as the projec-' tions B engage the said shanks of the jaws (3, even while the collar B is being moved back, the said jaws will remain closed and will open only when thesaid projections B enter the recesses C. With this structure it is therefore possible to cut a thread of even depth clear to the end of the work, which cannot be done in devices where the jaws open gradually. By adjusting the screws B so that they will project more or less from the collar B the position of the jaws relatively to each other when they are closed can be regulated so that the same tool can be used for threading blanks of different diameters. It will be understood that the jaws (3 receive dies on their forward ends, these dies being exchangeable, so that threads of diiferent diameters and different pitch may be out.

In Figs. 1 and 2 I have shown cutters D, which are secured to the jaws C by screws D.

In Figs. 3 and 4 I have shown .two semicircular segments D each of which has two cutters and is secured to the corresponding jaw C by screws D In order to provide for cases in which a thread is to be cut on a rod or pipe at a distance from its end, I prefer to make the body A with an axial opening G", into which the end of the rod or pipe may project. The time at which the tool begins to cut is governed by sliding the collar B forward through the medium of the lever A. The time the cutting action ceases is governed by the adjustment of the rod or projection B which extends lengthwise to the body A.

In the form of construction illustrated. by Figs. 6 and 7 I have substituted the following device for the parts 13 B B*: The collar B is provided with a pin F, extending diametrically through the body A and adapted to slide in slots A of said body. Where this pin crosses the central aperture or bore of the body, it is connected with a projection or rod G, extending lengthwise within the body. It will be understood that this red Ur is in the path of the blank on which the screw-thread is to be produced, and therefore at the proper moment the blank itself will engage said rod and shift the collar B back to a position in which the jaws Care released. To provide for longitudinal adjustment of the rod G, a set-screw F may be used, said screw fitting into the pin F.

I claim as myinvention and desire to secure by Letters Patent- The combination with the body having a guide-surface and die-holding jaws pivotally carried by said body, of a collar mounted to slide on said guide-surface and provided with projections adapted to engage the jaws, those surfaces of the said jaws which are engaged by the said projections being parallel in the closed position of the jaws, with the said guide-surface, the said jaws being provided near their pivots with recesses into which said projections are adapted to enter at the time the jaws open, to cause the said jaws to open suddenly.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

LEON SUSSMAN.

IVitnesses:

JOHN LOTKA, JOHN A. KEHLENBECK. 

